Death and reanimation of a cherished KJ CRD

gmctd · **Posted:** Sun Aug 31, 2014 1:29 pm

ASYMR, my KJ was tasered by the all-powerful, mostly-vengeful god of the Hebrews in AUG 2010 (dunno why, maybe some imagined slight in some past life) - fried the ECM with INMOTION II tune, melted the glowplug module, and completely discharged a new ULTIMA RED TOP battery (00.000v no hope of recharge fer 'at sucker!)- began a long search for replacement modules, and by SEPT 2011 I had found replacement ECM and TCM on eBay - KJ ran good after replacing the ECM, glow module and battery, so contacted KEITH at GDE for upgrades - $1050 later netted the GDE Hot tune and upgraded TCM - now, the performance was back, so I parked it for later discoveries - sometime last year the upset alarm sounded off with not even a squirrel within sight - reset the alarm only to have it resound again later in the week - did a scan to find many DTCs, but no comm with the other modules: TCM, BCM, ABS - engine wouldn't start due to low batt voltage, and a\c condensor fan was on high speed - recharged batt, engine started but rpm limited to 3000, and all the DANIN OPTIX instrumentation was hot, inoperable, and fried so put off resolution till later - battery continued to discharge so pulled it to keep on maintenance charge

Long story short (ha! too late fer that, you say?) I had been on seemingly eternal quest for replacement modules on eBay, so this month (AUGUST)I found a BCM, FCM, ABS unit, and AIRBAG module from an '05 KJ CRD, which I quickly acquired - several of the modules are specifically specific to the KJ CRD, so it was a serendipitous find - which brings us to what I did for the KJ today:

Being somewhat familiar with intranet computer communications and routers and stuff, and knowing that, because the KJ has separate Engine Control Module and Transmission Control Module, the KJ has it's very own router in the form of the FRONT CONTROL MODULE, or GATEWAY module, located beneath the battery, which functions to direct specific information on the busses to the correct modules - the ECU was the only module that responded to a scan, which could be any\all of the modules on the busses, but the FCM was most likely suspect - changed it out, scanned and cleared all DTC's but two: P0190 fuel pressure module high output and no load on glow plug module -
although P0190 results in the system being in limp-home mode with 3000rpm limit, a scan shows displayed fuel pressure (measured at the rail pressure sensor) = demand fuel pressure (which the ECM is calling for), around 6000psi at idle - a run around the block does not produce any other DTC's, and the failed FCM was not hot, nor had a distinct over-cooked odor, so at this point I do not suspect any of the other modules on the busses to be contributive - I do now have replacements for each just in case, tho..................

ATXKJ · **Posted:** Mon Sep 01, 2014 7:56 pm

Howdy gmctd - welcome back

I'm surprised the wirings not melted into a solid mass - lots of voltage

gmctd · **Posted:** Mon Sep 01, 2014 11:11 pm

Thanks - I haven't been here since briefly in SEPTOBER 2011 - was looking for some info I had posted prior to dropping out in 2010.

It was a massive inductive surge, rather than direct hit - I think the battery died thru the glow plug circuitry, as evidenced by the melted connector and plastic case housing the glow plug module - also , second of two DTC's is open glow plug load, likely all four plugs kaput! (don't even need 'em in TEXAS' mild winters) - keeping my fingers crossed, but I now have eBayed all the other computerized modules on the comm buss, just in case any more TX/RX circuitry vaporizes into the o'zone layer..........................

kdlewis1975 · **Posted:** Wed Sep 03, 2014 10:44 pm

Good to see you back on here. From the sounds of it, you're lucky the KJ didn't burst into flames given all of the things it's been through.

gmctd · **Posted:** Thu Sep 04, 2014 10:31 am

Thanks, KD - glad to be back, tho dunno fer how long.

You should have seen the trees on either end of the hapless KJ, not even to mention the roots beneath the vehicle: shredded charcoaled bark with splinters and toothpicks abounding......................

Sir Sam · **Posted:** Thu Sep 04, 2014 12:01 pm

Wow long time no see.

Did you end up getting a XJ diesel?

gmctd · **Posted:** Thu Sep 04, 2014 3:05 pm

Hi Sam - yes, I've had the'86 Diesel XJ since 2010, but have done nothing with it - too much work trying to get this deep-woods property in shape - it's not as easy at 74 as it was at 37 - 'nuther words: takes me all nite to do whut I used to do all nite!

Still looking for a suitable white '98-00 CHEROKEE 4-door with defunct 4.0 6-cyl to accept the transfusion - got all to rebuild the RENAULT 2.1, but also have other more modern drivetrain candidates

Death and reanimation of a cherished KJ CRD

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